DevOps, CI/CD and Automation

Hi,
When modifying one existing pro*c program,
i am getting the following error.
01036, 00000, "illegal variable name/number"
// *Cause: Unable to find bind context on user side
// *Action: Make sure that the variable being bound is in the sql statement.

I read few articles on the net but somehow i could not fix the bug.
I would be grateful if someone can provide me more details on what might
cause this error.
I suspect i get this error in a function which has some
sql statements which run for more than 10 to 15 times till the required
data is found.
Thanks in advance.
Giridhar